<template>
	<el-breadcrumb class="app-breadcrumb" separator="/">
		<transition-group name="breadcrumb">
			<el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
				<span
					v-if="item.redirect === 'noRedirect' || index == levelList.length - 1"
					class="no-redirect"
					>{{ item.meta.title }}
				</span>
				<a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
			</el-breadcrumb-item>
		</transition-group>
	</el-breadcrumb>
</template>

<script>
import pathToRegexp from "path-to-regexp";

export default {
	data() {
		return {
		levelList: null,
		};
	},
	watch: {
		$route() {
		this.getBreadcrumb();
		},
	},
	created() {
		this.getBreadcrumb();
	},
	methods: {
		getBreadcrumb() {
			// only show routes with meta.title
			let matched = this.$route.matched.filter(
				(item) => item.meta && item.meta.title
			);
			const first = matched[0];

			if (!this.isHome(first)) {
				matched = [{ path: "/home", meta: { title: "Home" } }].concat(
				matched
				);
			}

			this.levelList = matched.filter(
				(item) => item.meta && item.meta.title && item.meta.breadcrumb !== false
			);
		},
		isHome(route) {
			const name = route && route.name;
			if (!name) {
				return false;
			}
			return (
				name.trim().toLocaleLowerCase() === "Home".toLocaleLowerCase()
			);
		},
		pathCompile(path) {
			const { params } = this.$route;
			var toPath = pathToRegexp.compile(path);
			return toPath(params);
		},
		handleLink(item) {
			const { redirect, path } = item;
			if (redirect) {
				this.$router.push(redirect);
				return;
			}
			this.$router.push(this.pathCompile(path));
		},
	},
};
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
	display: inline-block;
	font-size: 14px;
	line-height: 50px;
	margin-left: 8px;

	.no-redirect {
		color: #97a8be;
		cursor: text;
	}
}
</style>
